Tachycardia: Fast Heart Rate | American Heart Association
https://www.heart.org/en/health-topics/arrhythmia/about-arrhythmia/tachycardia--fast-heart-rate
WEBNov 14, 2022 · Sinus tachycardia is an increase in the heart rate. In this condition, the heart’s natural pacemaker, the sinus node, sends out electrical signals faster than usual. The heart rate is faster than normal, but the heart beats properly. It’s a common response to exercise, but it’s concerning when it occurs at rest.
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